Consolidated Statements of Cash Flows (Parenthetical)			1 Months Ended			3 Months Ended	12 Months Ended
		Apr. 01, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2019 USD ($) ft²	Nov. 30, 2018 ft²	Jun. 30, 2013 ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Contribution to unconsolidated joint venture	[1]						$ 8,658,000	$ 0	$ 1,339,000
Investments in unconsolidated joint ventures			$ 38,240,000				38,240,000	$ 28,602,000
TRC-MRC 3, LLC
Number of acres for development | ft²				579,040	579,040
Transaction costs				$ 2,800,000
Gross profit		$ 1,537,000		1,500,000
Deferred gain on sale		1,537,000		1,500,000
TRC-MRC 3, LLC | Land
Contribution to unconsolidated joint venture		$ 5,854,000		$ 5,900,000
TRCC-East
Contribution to unconsolidated joint venture			2,805,000
Number of acres for development | ft²						326,000
Gross profit			334,000
Deferred gain on sale			501,000
Investments in unconsolidated joint ventures			$ 2,000,000				$ 2,000,000

[1] In April 2019, the Company contributed land with a fair value of $5.9 million to TRC-MRC 3, LLC, an unconsolidated joint venture formed to pursue the development, construction, leasing, and management of a 579,040 square foot industrial building on the Company's property at TRCC-East. The total cost of the land, inclusive of transaction costs was $2.8 million. The Company recognized $1.5 million in profit and deferred $1.5 million after applying the five-step revenue recognition model in accordance with Accounting Standards Codification (ASC) Topic 606 — Revenue From Contracts With Customers and ASC Topic 323, Investments — Equity Method and Joint Ventures. In December 2019, the Company contributed a newly constructed commercial multi-tenant building and underlying land with an aggregate fair value of $2.8 million to TA/Petro, an unconsolidated joint venture. The total cost of the building construction and land was $2.0 million. The Company recognized $0.3 million in profit and deferred $0.5 million after applying the five-step revenue recognition model in accordance with Accounting Standards Codification (ASC) Topic 606 — Revenue From Contracts With Customers and ASC Topic 323, Investments — Equity Method and Joint Ventures. Historically, cash outflows related to land development expenditures were accounted for within investing activities. For consistency, the Company will continue to classify cash outflows and cash inflows related to land development as investing activities.